Thermal shrinkage type fiber reinforced concrete

A fiber reinforced concrete technology, applied in the direction of fiber cutting, fiber treatment, fiber chemical characteristics, etc., can solve the problems of unsuitable concrete materials, low shrinkage strength, and difficult to disperse, and achieves low cost, high shrinkage rate, and improved mechanical properties. and the effect of rigidity

Pending Publication Date: 2022-05-13
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of fiber is mostly used in clothing fabrics. It has low shrinkage strength, sma

Method used

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  • Thermal shrinkage type fiber reinforced concrete
  • Thermal shrinkage type fiber reinforced concrete
  • Thermal shrinkage type fiber reinforced concrete

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] First prepare heat shrinkable fiber A by following the steps below:

[0036] Select 100 parts by weight of high shrinkage polyester chips, 20 parts by weight of SiC whiskers, 3 parts by weight of triethylhexyl phosphoric acid, 2 parts by weight of zinc dialkyldithiophosphate and 4.5 parts by weight of silane coupling agent , mixed to obtain raw materials. The raw materials are dried in a vacuum drying box at 60°C for 12 hours, put into a twin-screw extruder for blending, melt extrusion, and the primary fibers extruded from the extrusion port are cooled at a temperature of 10-20°C, and the first time is carried out at a temperature of 90-95°C. Pull and stretch, stretch 8 times, and cool at 10-20 °C; then perform secondary pulling and stretching at 110-115 °C, stretch 1 times, and obtain heat-shrinkable fiber A, which is cut into lengths of 9mm chopped fibers with a fiber diameter of 0.15mm. Properties of the obtained heat-shrinkable fiber A: its den...

Example Embodiment

[0039] Example 2

[0040] The heat-shrinkable fiber A in Example 1 was used to prepare concrete. The concrete mix ratio and curing method were the same as those in Example 1, except that the volume content of the heat-shrinkable fiber A was 2.5%, and the temperature of water bath curing was 100°C. .

Example Embodiment

[0041] Example 3

[0042] The heat-shrinkable fiber A in Example 1 was used to prepare the concrete, the concrete mixing ratio was the same as that of Example 1, and the volume content of the heat-shrinkable fiber A was 3%. After the concrete is poured and formed, it is cured in a standard curing environment for 24 hours, then placed in a steam curing box, heated at a rate of 15°C / h, cured at a constant temperature of 85°C for 3 hours, and then cooled to 20°C at a rate of 10°C / h. Finally, it was placed in a standard curing environment and cured for 28 days.

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Abstract

The invention relates to thermal shrinkage type fiber reinforced concrete. According to the invention, in a conventional concrete proportion, 0.9-4% by volume of heat-shrinkable fiber is added, and the heat-shrinkable fiber reinforced concrete is obtained after the concrete is molded and subjected to heat curing. The heat-shrinkable fiber is prepared by taking high-shrinkage polyester chips and a modifier as raw materials, carrying out melt blending extrusion through a certain temperature control program of an extruder, and carrying out traction and stretching. The thermal shrinkage type fiber shrinks under the thermal excitation effect and generates shrinkage stress, the shrinkage stress of the fiber is transmitted to a concrete matrix through the interface bonding effect of the fiber and the concrete matrix, and micro-scale prestress is uniformly applied to the concrete matrix, so that the flexural tensile strength, the volume stability and the crack resistance of the concrete are improved.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a heat-shrinkable fiber-reinforced concrete. Background technique [0002] The tensile strength of concrete is far lower than the compressive strength. During the service process, the structure is often cracked and damaged due to the bending load greater than the ultimate tensile strength of the material itself. The shortcoming of low ultimate tensile strength is also the direct cause of concrete cracking due to shrinkage (expansion) stress, temperature stress and humidity stress. [0003] In order to improve the crack resistance of high-strength concrete, fibers are usually used to resist cracking and toughen the concrete, so as to improve the tensile strength of concrete and prevent cracks from expanding. However, the fibers commonly used in concrete currently prevent the cracks from further expansion by bridging the concrete cracks after they appear, and the effect on improv...

Claims

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Application Information

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IPC IPC(8): C04B16/06D01F6/92D01F1/10D01D5/098D01G1/00
CPCC04B16/0683D01F6/92D01F1/10D01D5/098D01G1/00Y02W30/91
Inventor 吴静杨文丁庆军王罗新王桦
Owner WUHAN TEXTILE UNIV
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